相关实验视频

Updated: Jan 9, 2026

Brain Infarct Segmentation and Registration on MRI or CT for Lesion-symptom Mapping

Brain Infarct Segmentation and Registration on MRI or CT for Lesion-symptom Mapping

Published on: September 25, 2019

从多式核磁共振成像放射学中无监督发现缺血性中风表型

Subasini Ramesh¹, Snekhalatha Umapathy¹

¹Department of Biomedical Engineering, SRM Institute of Science and Technology, Kattankulathur, Chennai 603203, India.

Biomedical physics & engineering express

|December 1, 2025

概括

这项研究开发了一个无监督的放射性管道,使用多式核磁共振 (MRI) 来分组缺血性中风病变. 该方法有效地在没有手动细分的情况下对病变进行分层,为低资源设置提供可扩展的解决方案.

科学领域:

放射学放射学是一门学科.
医疗成像医学成像
人工智能的人工智能

背景情况:

缺血性中风病变表现出显著的异质性.
缺乏注释的结果和有限的资源阻碍了损伤的分类.
多模式MRI数据对无监督分析提出了挑战.

研究的目的:

开发一个无监督的,标签独立的放射性管道,用于分组缺血性中风病变.
在中风成像中解决病变异质性和资源限制.
为了实现生物学上有意义的病变分层,而无需手动细分.

主要方法:

液体减弱倒置恢复 (FLAIR),明显扩散系数 (ADC) 和敏感度加权成像 (SWI) 序列的分析.
使用基于百分点的值和差异过的特征选择来识别损伤.
用统一的多重近似和投影 (UMAP) 减少维度,然后进行集群 (K-means++,聚合,光谱).

主要成果:

UMAP与聚合集群结合,产生了高的轮得分 (3个集群为0.784,5个集群为0.778).
达到了最佳的共识稳定性 (PAC分数为0.000).
克鲁斯卡尔-瓦利斯测试确定了25-36个显著特征,主要来自ADC和SWI序列,其中5个群集模型显示出更细微的表型分离.

结论:

无监督的框架使生物学上有意义的病变分层成为可能.
管道是可扩展的,适合低资源环境.
这种方法为未来的中风成像诊断和预后建模提供了基础.

关键词:

达成共识稳定性的共识减少维度,减少维度.功能意义特性意义多模式的MRI.无线电学 (radiomics) 是一种无线电学.脑中风的表型化中风的表型化没有监督的集群聚类.

更多相关视频

Identification of Disease-related Spatial Covariance Patterns using Neuroimaging Data

Identification of Disease-related Spatial Covariance Patterns using Neuroimaging Data

Published on: June 26, 2013

A Magnetic Resonance Imaging Protocol for Stroke Onset Time Estimation in Permanent Cerebral Ischemia

A Magnetic Resonance Imaging Protocol for Stroke Onset Time Estimation in Permanent Cerebral Ischemia

Published on: September 16, 2017

相关概念视频

Imaging Studies for Cardiovascular System IV: CMRI

Imaging Studies for Cardiovascular System IV: CMRI

Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...

Magnetic Resonance Imaging

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...

Imaging Studies VII: Vascular Imaging

Imaging Studies VII: Vascular Imaging

DefinitionRenal angiography, also known as renal arteriography, is an imaging technique used to obtain a comprehensive view of blood flow and the vascular structure of blood vessels in the kidneys and surrounding areas.PurposeRenal angiography detects blood vessel abnormalities in the kidneys, such as aneurysms, stenosis, thrombosis, vascular tumors, and renal artery stenosis. It evaluates kidney function and guides interventional treatments like angioplasty or stent placement.Pre-Procedure...